Print Cartridge Part Numbers When replacing print cartridges for your HP Deskjet 9xx series printer, buy print cartridges with the following part numbers: Black: HP 51645 Series or HP No. 45 Tri-Color: HP C6578 Series or HP No. 78
When replacing print cartridges for your HP Deskjet 9xx series printer, buy print cartridges with the following part numbers: